Duplicator attachment for lathes



26, 1952 H. J. SIEKMANN ETAL 2,587,542

DUPLICATOR ATTACHMENT FOR LATHES Filed Sept. 10, 1947 4 Sheets-Sheet l INVENTORS.

. HAROLD J. SlE/(MA/VN BY GEORGE J. KASSELMANN ATTORNEYS.

Feb. 26, 1952 H. J. SIEKMANN ETAL 7,

DUPLICATOR ATTACHMENT FOR LATHES Fil e d Sept. 10, 1947 4 Sheets-Sheet 2 IN VEN TORS. HAROLD J. SlE/(MA/V/V GEORGE J. KASSELMA/VN A TTORNE'YS.

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Feb. 26, 1952 H. J. SIEKMANN ETAL DUPLICATOR ATTACHMENT FOR LATHES Filed Sept. 10, 1947 4 Sheets-Sheet 3 I! I I r INVENTORS. HARO J. S/E/(M N W 50/? ./.kAssL /v/v Feb. 26, 1952 H. J. SIEKMANN ETAL DUPLICATOR ATTACHMENT FOR LATHES 4 Sheets-Sheet 4 Filed Sept. 10, 1947 N amm RAL Vsm m I. DE 4 a mm H Y I B 2 J KN mm L ATTORNEYS.

swivel slide 2| by a suitable set screw 35. Fluid pressure for operating the cylinder 3| is derived from a suitable pressure source such as the pres sure supply line 35, Figure 3, which is connected to the pressure supply spindle 37 having the passageway 38, Figure 3, which in turn supplies pressure to the annular groove 39 to the supply passageways 4c connected to the pressure supply ports Me of the reciprocable tracer controlled.

valve sleeve 4|. The ports 4|a by the tool slide member while suitable exhaust control ports 44 may be relatively adjusted to the mating exhaust ports 45 on the fixed valve stem member 43 upon reciprocationof thevalve sleeve 4|. The passageways 46- and 41' com'municatethrough the respective passage- Ways 48 and 49 formed in the tool slidemember 25 with the respective pressure chambers 50 and 5l of the fiuid'pressure cylinder 3|, as best seen in Figures 2 and 4. Exhaust discharge from ports 44 is collected in the chamber-44a in the tool slide 25 and returns to a fluid reservoir (not shown) through line 44?).

"In the servo control valve sleeve 4| is fixed a screw 52 having a headed end 52a under which i is provided a compression spring 53 engaging against the surface 54 of the outer cover 25a fixed to the tool slide 25 by suitable screws 25b so as to normally move or bias the valve sleeve 4|", to-the left in Figure '3, so that the tool slide normally is fed in'toward the" work or to the right as shown in Figures 3 and 4. A lever arm 55- is' pivotally mounted on a pin 55 rigidly held in,the member 25a of the tool slide 25 and has an upper end portion 56a engaging the head 52d of the screw 52 and has a lower end portion 51 engaged by a tracer finger plunger 58 carried.

in a bracket 59 rigidly fixed-to the tool slide 25 by suitable screws 60. A stop screw 6| mounted in the lever 55 and engaging a stop pin 62 fixed in the plate member 25a of the tool slide 25 serves to limit the counterclockwise rocking motion, Figure 3, of the lever 55 and therefore the biased adjustment of the tracer valve sleeve 4| by the spring 53 so that the proper normally infeed released position of the tracer finger 58 causes the tool slide to move towards the work at the desired rate, and the tracer plunger 53 has a chisel tip or tapered end 63, Figures 1 and 3, prefin turn are matched in a well-known manner with suitable ports 42 in fixed valve stem member 43 carried 4 13 formed in a projecting plate member 14. A clamping nut and washer 15 are provided on the lower end of the clamping bolt H which may be tightened when the guide member 51 has been positioned in desired adjusted position,

Referring to Figure 8, the template bar 64 is pivotally connected by a suitable pin 16 to a cross sliding member 11 guided in suitable guideways 18 formed in a bracket 19 suitably clamped to the machine frame or lathe bed In so that the template bar 64 is'positively held against longitudinal movement parallel to the work spindle axis II! but may move transversely thereof in response to movements of the cross slide l6 of the lathe. It is to be noted that the direction of reciprocation of the tracer finger plunger 58 as indicated by the line or plane 80 is at all times radially of the axis 69 of pivotal mounting of the template bar guide 51 so that no matter to what position the swivel slide 2| is swung, the line of movement in the plane 85 will intersect the axis 69 of the Pivot 68. As can best be seen in Figure 8, this results in a minimum of change of relative position-of template and tracer tip especially when; the tracer is operating on'the innermost portion 8| of the template surface for any angular setting of the swivel slide 2|.

Furthermore, should there not be exact parallel alignment of the template bar, such as its surface 6611 with the work spindle axis-I8 and'the longitudinal movement of the carriage l3 along the bedways and I2, no appreciable deleterious efiects will 'result in the exact parallelism of cutting of the work piece surface. For instance, when doing turning operations as shown in Figure 5, the various steps 82, 83, 84; and 85 will-all be out exactly parallel to the axis of rotation I 8 of the lathe despite the fact that the template bar and its template T are not set exactly parallel to the lathe'bedways, the spindle axis of rotation l8, and the carriage movement. The template bar may be misaligned from true parallelism-as indicated by the difference between the line 66a and the line 86, Figure 8g by an amount, say= one thirty-second or one-sixteenth of an inch,

as indicated at 81. The template" controlled mechanism will still turn all theportions B2, 83,

84, and 85 perfectlystraight and parallel to thework axis I8. This follows because the point 88,-

* Figure 8, follows the exact parallel feedingmoveerably corresponding to the shape of the cutting a point P of the cutting tool 28 which engages the irregular surface S of a template plate T carriedion a template bar 64. .7

The template bar is slidably mounted-on suitable guideways 65 and 66 of the template bar guide member 61. This member 61 is. pivotally mounted on a stud 68 to relatively swing about an'axis 69. This stud 68 is carried on a projectingplate member 14 fixed'to and carried by the swivel slide 2| on the carriage l5. A suitable adjusting nut and washer ID on thestudjifi holds the'guide member 61 in proper adjustable pivotal condition on the stud 58. A clamping bolt 1| rigidly fixed by a suitable threaded connection '12 in the guide plate 61 extendsdownwardly, as best seen in Figure 3. through an arcuate. slot ment path indicated by the line 86' even though the guide member 61 does not have its guide ways 65 and 66 set exactly parallel to'the spindle I axis 8. What actually happens is that the point 88 always stays on the line86 and the end or pivot connection I6 of the template .bar 64 with the cross slidingmember 11 causes the member to adjust itself automatically in the guideways 18 in in-and-out movementto'take care of and- "allow the movement of the'guide member 61 by the lathe carriage to take place with perfect ease and efilciency. At the same'time, it will be noted, however, that the point 88 always remains a fixed distancefrom the point 89 on the work spindle axis Id of the lathe regardless as to whether or not the template bar 64 is precisely set parallel to the axis l8.

It will be furthermore noted that ordinary-l slide misalignments such as indicated for the template bar 64 relative to the axis H}, as indl cated' at 81, have, substantially no efiectwhatever on the relative distance between the tip" 63 of the tracer finger and the point 88 of the guideway engagement betweenthe template bar -64 and the guide member 61 as defined by a line 90 passing through the pivot axis 63 perpendicu;

'stantially constant, well w lar to the "spindleiaxis .18.. Since the relation ship between the points Bil-and 69 remain sub!- t in any practicabl limits to which the work is to be finished, and that these points also remainjoonstant with regard to the point 89 on the'work spindle axis, it therefore follows in this arrangement-that accuracy. ofesetting ofth'e template bar 64 exact parallelisxn'with the feedingm'ovement' and the work spindle axis is not required, therefore facilitating a rapid set-up and a high degree of 'accur'acy and efficien y intu'rning the work without requiring the 'veryacculate and precise setting of template bars as used in prior apparatus. By arranging the direction of tracer finger reciprocation in a plane of movement 80 at all times intersecting the axis 69 of pivoting of the guide member 61, a maximum degree of accuracy is maintained in reproducing the template T on the work piece for any position of swiveled location of the swivel slide 25 and the duplicator attachment thereon for any normal misalignment which may occur between the template bar 64 and the direction of feeding movement of the carriage along the bedways.

The features discussed in connection with Figures 1, 5, and 8 pertaining to turning operations with the Work on centers are equally well adaptedito facing operations, as when work W is held in a chuck as drawn in Figure 6. In this instance the template bar 64 is positioned transverse of the lathe and the cross slide used for the feeding movements of the tool, all other relationships remaining the same as described. The bracket 19 (not shown in Fig. 6) is fixed to the machine frame so the sliding member 11 moves at right angles to the cross slide movement. In Figure 7 is shown the same arrangement as in Figure 6, but with the tool slide swivel in the opposite direction to most advantageously machine a work piece W having surfaces lying intermediate those of the work in Figures 1 and 5, and Figure 6.

There has thus been provided, in a duplicating attachment, a template bar arrangement in which the template bar is held against movement ih the direction'of relative feeding of the attachment along a work piece and in which the template bar is guided by a member mounted on the duplicating attachment pivotal connection having an axis through which passes a plane defining the direction of relative reciprocation of the tracer finger and template for any position of relative angular movement of the tool slide of the duplicating attachment relative to the workpiece. There is provided an arrangement, in which the template bar has movement relative to a tracer finger for controlling the relative movement of a cutting tool to a work piece, which is bodily carried by the attachment for movement to and from the work while at the same time it is guided for the relative movement of template and tracer finger in feeding movement in such a way that the direction of movement of the tracer finger intersects a pivotal connection of a guide member for the template bar on the attachment and in which there is provided means to allow the bodily movement of the template bar transverse to the feeding movement while looking the template bar against movement in the feeding direction which last mentioned means is rigidly fixed to the machine frame.

While the apparatus herein disclosed and described constitutes a preferred form of themvention, it is to be understood that the apparatus is capable .of mechanical alteration without .departing from the spirit of the invention and that suchzmechanical arrangements and commercial adaptations as fall within the scopeof the ap+ pendant claims are intended to .be included herein.

, Having thus fully set forth and described this invention, what is claimed as new and desired to be secured by United States Letters Patent 1. Inra duplicatorfor .a mule having a bed, a

carriage, a cross '.slide,.a swivel slide, a tool slide reciprocably mounted on said swivel slide, and a tool mounted on the tool slide, an actuating member interconnected between said swivel slide and said tool slide, a tracer mounted on said tool slide, a tracer finger on said tracer, a, tracer tip on said finger, a template bar guide member means for pivotally mounting said guide member for horizontal swinging movement about a vertical axis on said swivel slide for swinging movement of said guide member about an axis at right angles to the movement of said tool slide into a plurality of adjusted positions, means for locking said guide member in any of its adjusted positions, guide ways for said tool slide so positioned to guide said tracer tip in a plane defined by'said tip and the axis of said pivotal mounting of said guide member, a template bar slidably supported on said template bar guide member, a template carried on said bar operatively engaging said tracer tip to actuate said tracer, and means for adjustably connecting said template bar to the bed of said lathe. I

2. In a duplicator for a lathe having a bed, a carriage, a cross slide, a swivel slide, a tool slide reciprocably mounted on said swivel slide, and a tool mounted on the tool slide, an actuating member interconnected between said swivel slide and said tool slide, a tracer mounted on said tool slide, a tracer finger on said tracer, a tracer tip on said finger, a template bar guide member means for pivotally mounting said guide member for horizontal swinging movement about a vertical axis on said swivel slide for swinging movement of said guide member about an axis at right angles to the movement of said tool slide into a plurality of adjusted positions, means for locking said guide member in any of its adjusted positions, guide ways for said tool slide so positioned to guide said tracer tip in a plane defined by said tip and the axis of said pivotal mounting of said guide member, a template bar slidably supported on said template bar guide member. a template carried onsaid bar operatively engaging said tracer tip to actuate said tracer, and meansfor adjustably connecting said template bar to the bed of said lathe, including a bed bracket, means for clamping said bracket to the bed, a transversely movable slide on said bracket arranged for movement perpendicular to the direction of movement of the carriage along the bed, and a pivotal connection between said transversely movable slide on said bracket'and said template bar.

3. In a duplicator for a lathe having a bed, a carriage, a cross slide, a swivel slide, a tool slide horizontally reciprocably mounted on said swivel slide, a tool mounted on said tool slide, a tracer finger on said tool slide, a tracer tip on said finger, a template bar guide member, means for pivotally mounting said guide member for horizontal swinging movement about a vertical axis on the swivel slide to a plurality of adjusted positions, means for locking said guide member in any of its adjusted positions, guide ways for said tool slide so positioned to guide said tracentip in a plane defined by said tip and the axis of said pivotal mounting for said guide member, a template bar slidably supported on said template bar guide member, a template carried on said template bar operatively engaging said tracer tip to actuate said tracer, and means for adjustably connecting said template bar to the bed of said lathe.

HAROLD J. SIEKMANN.

GEORGE J. KASSELMANN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Miles Feb. 7, 1882 Hodge Aug. 1, 1893 Lodge Nov. 9, 1897 Hill Apr. 19, 1898 Townsend Aug. 22,1916 Groene Sept. 2, 1919 Lovely July 12, 1927 Bickel Aug. 18, 1936 Von Zelewsky Mar. 9, 1948 Siekmann May 22, 1951 'Waterson July 3, 1951 

